The Yale P85 and P89 are deadlocking nightlatches suitable for left and right handed and inward opening doors with a thickness of up to 57mm. This specific variant features a polished brass cylinder and a narrow 40mm backset. The locks offer high security and are covered by a 2 year guarantee. Each lock is supplied with 2 keys. Key features include bump resistant cylinders. The inside handle can be deadlocked by a reverse turn of the key in the outside cylinder after closing the door. A snib allows you to deadlock or hold back the latch. The lock can also be deadlocked by the snib button internally, making it inoperable by key or handle.